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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Operating activities    
Net income $ 7,606 $ 4,562
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation expense 1,853 1,762
Amortization of intangible assets 2,885 2,551
Loss on disposal of fixed assets 10  
Provision for doubtful accounts 286 264
Investment discount and premium amortization (192) (23)
Stock-based compensation 6,656 6,163
Tax benefit from business acquisition   (2,415)
Changes in assets and liabilities:    
Accounts receivable, net (374) (1,186)
Inventories (4,942) (3,369)
Prepaid expenses and other current assets (1,081) 1,198
Other assets 161 (601)
Accounts payable 550 875
Accrued liabilities (2,090) (1,653)
Deferred revenue 421 412
Other long-term liabilities 295 252
Net cash provided by operating activities 12,044 8,792
Investing activities    
Purchases of available-for-sale investments (32,372) (28,933)
Proceeds from sales of available-for-sale investments 1,000 950
Proceeds from maturities of available-for-sale investments 31,750 20,268
Purchases of property and equipment (1,851) (1,618)
Business acquisitions, net of cash acquired (343) (7,881)
Net cash used in investing activities (1,816) (17,214)
Financing activities    
Proceeds from exercise of options for common stock 3,155 7,775
Payments for taxes related to net share settlement of equity awards (4,608) (2,596)
Repurchase of common stock (11,050) (1,821)
Payment of debt issuance costs (113)  
Net cash (used in) provided by financing activities (12,616) 3,358
Effect of exchange rate changes on cash and cash equivalents (150) 330
Net change in cash and cash equivalents (2,538) (4,734)
Unrestricted and restricted cash and cash equivalents at beginning of period 30,034 35,060
Unrestricted and restricted cash and cash equivalents at end of period 27,496 30,326
Supplemental disclosure of cash flow information    
Cash paid for interest 66 63
Cash paid for taxes 685 834
Supplemental schedule of non-cash investing and financing activities    
Business acquisitions holdback liability   1,068
Purchases of property and equipment financed by accounts payable 584 178
Net unrealized losses on available-for-sale investments $ (35) $ (3)